Welcome to Medical News Today

Healthline Media, Inc. would like to process and share personal data (e.g., mobile ad id) and data about your use of our site (e.g., content interests) with our third party partners (see a current list) using cookies and similar automatic collection tools in order to a) personalize content and/or offers on our site or other sites, b) communicate with you upon request, and/or c) for additional reasons upon notice and, when applicable, with your consent.

Healthline Media, Inc. is based in and operates this site from the United States. Any data you provide will be primarily stored and processed in the United States, pursuant to the laws of the United States, which may provide lesser privacy protections than European Economic Area countries.

By clicking “accept” below, you acknowledge and grant your consent for these activities unless and until you withdraw your consent using our rights request form. Learn more in our Privacy Policy.

Please accept our privacy terms

We use cookies and similar technologies to improve your browsing experience, personalize content and offers, show targeted ads, analyze traffic, and better understand you. We may share your information with third-party partners for marketing purposes. To learn more and make choices about data use, visit our Advertising Policy and Privacy Policy. By clicking “Accept and Continue” below, (1) you consent to these activities unless and until you withdraw your consent using our rights request form, and (2) you consent to allow your data to be transferred, processed, and stored in the United States.

Get the MNT newsletter

Email an article

You have chosen to share the following article:

How elderberries can help you fight the flu

To proceed, simply complete the form below, and a link to the article will be sent by email on your behalf.Note: Please don't include any URLs in your comments, as they will be removed upon submission.

We do not store details you enter into this form. Please see our privacy policy for more information.

'Stop using BMI as measure of health,' say researchers

A new study shows that 54 million Americans whose BMI classes them as overweight and obese are in perfect health according to cardiometabolic measures, while 21 million whose BMI puts them in the normal category are unhealthy.

Altogether, say the authors, an estimated 75 million adults in the US are misclassified as either healthy or unhealthy when BMI is used as the sole health indicator.

The study provides more evidence to support the idea that a person's body mass index (BMI = weight in kg divided by height in m2) is a flawed measure of health.

In spite of this, BMI continues to be used as a yardstick for determining health status. Many employers use it to calculate workers' health care costs, note the researchers behind the new study, who report their findings in the International Journal of Obesity.

And soon, if a rule proposed by the Equal Employment Opportunity Commission (EEOC) is adopted, US employers will be allowed to charge employees up to 30% of health care costs if they fail to meet certain health criteria such as not having a BMI in the normal range (between 18.5 and 24.99).

The study, led by A. Janet Tomiyama, an assistant professor of psychology at the University of California-Los Angeles (UCLA), analyzed the link between BMI and cardiometabolic health using data from the most recent National Health and Nutrition Examination Survey (NHANES).

BMI misclassifies nearly 75 million Americans as healthy or unhealthy

The analysis shows nearly half of Americans whose BMI puts them in the overweight category (34.4 million people) are actually healthy according to cardiometabolic measures, as are 19.8 million whose BMI classes them as obese.

The researchers also found that 15% of Americans (2 million people) whose BMI calculation is 35 or higher - thus classing them as very obese - are also healthy.

Prof. Tomiyama says:

"Many people see obesity as a death sentence. But the data show there are tens of millions of people who are overweight and obese and are perfectly healthy."

She says that these people would be unlikely to incur higher medical expenses and it would be unfair to charge them higher premiums based only on their BMI.

The study also finds over 30% of Americans whose BMI puts them in the normal range (nearly 21 million people) are actually unhealthy according to cardiometabolic measures.

Altogether, say the authors, nearly 75 million adults in the US are misclassified as either healthy or unhealthy when BMI is used as the sole health indicator.

'Final nail in the coffin for BMI'

Prof. Tomiyama says she is surprised by the large numbers they found in the new study and remarks how unfair it is that many healthy people may be penalized, while many unhealthy people will not get charged more for their health insurance, based on their BMI. She notes:

In previous work, her lab - which specializes in diet, stress and health - has also found no clear link between weight loss and improvements in blood pressure, diabetes, cholesterol, glucose and other health measures.

Prof. Tomiyama now intends to study people with high BMI who are very healthy.

Co-author Jeffrey Hunger, a doctoral candidate at the University of California-Santa Barbara, urges people to obsess less about their weight and focus on following a healthy diet and taking regular exercise.

He says their study confirms how flawed BMI is as an indicator of health and concludes that "this should be the final nail in the coffin for BMI."

In 2013, Medical News Today reported on a Science paper that discusses why BMI is an inaccurate measure of body fat content and how there is an urgent need for accurate, practical and affordable tools to measure biomarkers that can better predict the risks of disease and death.

2019 Healthline Media UK Ltd. All rights reserved. MNT is the registered trade mark of Healthline Media. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional.